Air compressor



Jul 1 1924,. 1,500,052

. R. J. CAUFFIELD ET AL AIR COMPRESSOR Filed March 24 1923 2 Sheets-Sheet 1 .RJJ'anf beZzZ %4v7 W C- fl-Ca/ufz'eld INVENTOR 7% MW ATTORNEY July 1 1924 R. J. CAUFFIE ET AL AIR COMPRESSOR Filed March 24. 1923 2 Sheets-Sheet 2 1241601 ezd e5 'ez TTOR Patented July 1, 1924.

UNITED STATES RoBEnr oanrrrnnn AND CARL o. oaur rrnnn, or nuns, onio.

AIR COIVIIBRESSOR.

Apphcation fi led March 24, 1923. Serial No. 627,399.

Tool-Z whom it only concern-.-

' Be it known that we, ROBERTJ'. Gaurrmnn and CARL C; CAUFF IELD, citizens of the United States, residing at Niles, in the county of Trumbull and State of Ohio, have invented new and useful Improvements in Air Compressors, of which the following is aspecification. i

This invention contemplates the provision of a pressure regulating. device or the like which normally is in open communication with the air compressor and the device to be regulated by pressure, so that when the pressure falls below a predetermined degree, the communication will be automatically closed or partially so, to permit the pressure to be brought up to a prerequisite degree for the proper operation of the device con- I trolled by the pressure.

The nature and advantages of the inven tion will be better understood when the fol.- lowing detailed description is read in con nection with the accompanying drawings, the invention residing in the construction, combination and arrangement of parts as claimed.

In the drawings forming part of this application, like numerals of reference indicate similar parts in the several views, and wherein:

Figure l is a view in elevation of the regulating device forming the subject matter of the invention.

Figure 2 is a view taken at a right angle to Figure 1.

Figure 3 is an enlarged sectional view through the valve chamber showing the normal position of the parts.

Figure 4 is a similar view showing the position of the valve and its cooperating parts when pressure falls below a predetermined degree. 1

Referring to the drawings in detail, 10 indicates a casting provided with a bore 11 which opens at one end of the casting to communication with a pipe 12 leading from the reservoir, forming part of the air compressor. Thepipe 12 is coupled to a branch pipe 13 as indicated, the pipe 13 communicating with a restricted bore 14; which leads to a valve chamber 15, the valve chamber having an outlet 16 to a coupling 17, one end X of which is adapted to communicate with the governor to be controlled by the pressure, while the opposite end Y of this coupling is adapted to communicate with the unloader not shown.

Supported by the casting 10 is a split eX- pansible coil 17 adapted to be expanded and contracted with the increase and decrease of the pressure, the operation controlling the degree of movement of the ball valve 18 which operates within the valve chamber 15. The valve 18 operates between two seats, one indicated at 19 forming the bottom of thevalve chamber, and the other indicated at 20 formed by vthe adjacent end of the stem 21 of an adjusting nut 22, the latter being threaded to a bore in the upper end of the casting 10 as shown. This nut and stem is also provided with a longitudinal bore 23 which slidably receives the non-threaded re duced extension 24 of a threaded adjusting element 25 which is associated with a collar 26. This collar is supported from the adjacent ends of the expansible coil 17 through the instrumentality of pivoted links 26. Arranged above the collar 27 and asso ciated withthe screw 25 is a lock nut 28.

The operation of the regulating device is as follows:

Pressure from the reservoir forming part of the compressor passes through the pipe 12 into the expansible coil 17 expanding the latter so that the coil elevates the adjusting screw 25 through the bore of the nut 21, which permits the valve 18 to rise to the limit of its movement, completely uncovering the outlet port 19 leading from the valve chamber 15. The pressure also passes from the pipe 12 through the pipe 13 into the chamber 15 through the reduced bore 14 and with the valve 18 efiectively held against the upper seat, the pressure passes through the bore 16 into the coupling at one side of the casting, from where the pressure passes to the governor or to the means to be controlled and also to the unloader, the governor is thus controlled by pressure, as long as the pressure remains at a predetermined degree, but just as soon as the pressure is lowered, the governor is lowered so that the pump can speed up for the purpose of re plenishing the reservoir with additional pressure. As the pressure is lowered, the coil 17 contracts, thereby moving the stem 24 of the adjusting screw 25 through the nut 21, forcing the ball valve upon its lowermost seat, the pressure then admitted to the chamber 15 escapes around the valve stem and through the space surrounding the stem 24 While a portion goes to the unloader in the usual manner. It is of course obvious, that by adjusting the screw 25 independently of the expansion or contraction of the coil 17', the degree of pressure necessary to actuate the coil can be varied and regulated.

While it is believed that from the foregoing description, the nature and advantages of the invention Will be readily apparent, We desire to have it understood that we do not limit ourselves to What is herein shown and described and that such changes may be resorted to when desired as tall within the scope of What is claimed.

inediately above the valve and constituting a stop therefore, and a contractable coil connected to and regulating the movements of said stem.

2. A regulator 01 the oharacer described including a pressure actuated valve, pres sure actuated means for limiting the move ments of the valve, said means including a hollow coil adapted to be automatically expanded and contracted incident to the increase and decrease of pressure therein, a stem supported by the coil and, movable toward and away from the valve incident to the expansion and contraction of the stem being adjustable with relation to the coil to vary the pressure required to actuate the latter.

In testimony whereof We aflix our signa- 40 tures= A 

